sound in Army Dreamers

[samsung!ulowell!willow.dnet!legerc@uunet.uu.net (SLEDGEHAMMER)]

I haven't yet read the FAQ, but I can assume that this question won't be there.

What is the instrument at the _very_ start of Army Dreamers (and throughout the
song).  It consists of two beats, but I can't identify it.

Does anyone know?  Thanks,

Chris 

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